Early Cellular Distinction (IMAGE) Rockefeller University Caption Different cells types are shown above in an early human embryo, 6 days after fertilization. Cell boundaries are indicated in white, cells of the inner cell mass (which will give rise to the embryo proper) are in green, and trophoblast cells (which will give rise to extraembryonic tissues) are in purple and magenta. Credit Gist Croft, Alessia Deglincerti, and Ali H. Brivanlou/The Rockefeller University Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.